Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

A beautiful braided reach of the Sag River, with the Philip Smith Mountains in the Arctic National Wildlife Refuge (ANWR) in the background.

From the Sagavanirktok River in Alaska

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington

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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Caddisfly Species Rhyacophila angelita (Green Sedges)

Where & when

Time of year : September and October

This transcontinental species, like Rhithrogena brunnea, is far more abundant in the West than elsewhere.

In 48 records from GBIF, adults of this species have mostly been collected during August (44%), September (17%), October (13%), July (8%), June (8%), and May (6%).

In 41 records from GBIF, this species has been collected at elevations ranging from 10 to 10466 ft, with an average (median) of 8022 ft.

Species Range

source

Map of specific collection sites

Egg-Laying behavior

Time of day: Evening

Larva & pupa biology

Current speed: Fast

Environmental tolerance: Prefers clear water

Start a Discussion of Rhyacophila angelita

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.